CN108871511A - A kind of linkage type industrial flow accurate measurement method - Google Patents
A kind of linkage type industrial flow accurate measurement method Download PDFInfo
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- CN108871511A CN108871511A CN201810695193.5A CN201810695193A CN108871511A CN 108871511 A CN108871511 A CN 108871511A CN 201810695193 A CN201810695193 A CN 201810695193A CN 108871511 A CN108871511 A CN 108871511A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
A kind of linkage type industrial flow accurate measurement method, during solving traditional flow measurement, the problem of flowmeter is only the orphaned devices of a fluid metering, and measuring equipment not related to upstream and downstream technique and surrounding forms interactive cooperation, the measuring accuracy of flowmeter is caused to decline to a great extent.The metering method is analyzed by carrying out the algorithm based on technique to existing flow metering method, flowmeter can be produced with the upstream flow media nearest apart from the flowmeter in metering process or operating condition carries out process ration, then flow results are calibrated by the self-calibration function in flowmeter；Then, existing flowmeter and upstream flow meter are subjected to communication interconnection, and carry out self-recision；Moreover, considering the situation of industry spot straight pipe deficiency in metering process.This method can interconnect with the other measuring equipments of upstream and downstream, and the levels of precision of industrial flow metering can be improved, and optimize upstream and downstream production technology, reduce production cost, promote industrial automation level.
Description
Technical field
The invention belongs to technology of instrument and meter fields, and in particular to one kind can be mutual with the other measuring equipment interconnections of upstream and downstream
It is logical, the levels of precision of entire industrial flow metering can be effectively improved, optimizes upstream and downstream production technology, reduces enterprise's production cost,
Promote the linkage type industrial flow accurate measurement method of industrial automation level.
Background technique
Currently, industrial flowmeter although it is many kinds of, principle is different, all have the characteristics that one it is common, i.e.,：It is flowing
In the measurement process of amount, data can only be read by this stand-alone device of flowmeter being mounted on pipeline, and by secondary
The equipment such as table, flow computer transfer data to industrial control system.And flowmeter due to can not carry out Large Diameter Pipeline fail to be sold at auction in fact it is fixed and
Various special medias and working condition calibration, cause flowmeter during actual metered, there is error even deviation；Also, add
Each production firm technological level limitation, measurement error can further increase.Simultaneously as the fluctuation tune of upstream and downstream technique
The reasons such as whole and live flow development length deficiency, often result in working condition used in flowmeter and change, so that
In the condition range of flowmeter in the process of running, when being not in its initial designs, so causing the measuring accuracy of flowmeter
It declines to a great extent, seriously affects the levels of precision of entire industrial flow metering, be unfavorable for the development of industrial automation.Therefore it is necessary to right
Existing industrial flow metering method is improved.
Summary of the invention
The present invention addresses the above problem, and providing one kind can interconnect with the other measuring equipments of upstream and downstream, can have
Effect improves the levels of precision of entire industrial flow metering, optimizes upstream and downstream production technology, reduces enterprise's production cost, promotes industry
The linkage type industrial flow accurate measurement method of automatization level.
The technical scheme adopted by the invention is that：The linkage type industrial flow accurate measurement method includes the following steps：
Step 1: process algorithms and metering process data interaction；Existing flow metering method is carried out based on technique
Algorithm analysis, allows flowmeter in metering process, can produce or run with the upstream flow media nearest apart from the flowmeter
Situation carries out process ration；After completing technology Calculation analysis, the gross data that flowmeter itself measures can be obtained；
Step 2: the self calibration of linkage type metering process；Flowmeter, can be with after the data for obtaining batching metering device
Itself existing continuous data is compared；Then judge whether it is consistent with theoretical continuous data, if consistent or error
Within allowed band, then it can be assumed that metric results are credible；If error exceeds allowed band, flowmeter is needed to measure
Self calibration is carried out in the process；
Step 3: upstream and downstream communication and linkage type correction algorithm；Existing flowmeter and upstream flow meter are used and are based on nothing
The mode of line communications protocol carries out communication interconnection, installs wireless transmission and receiving module additional inside the flowmeter of intercommunication, and flowing
The chip layer of meter is implanted into self-recision algorithm；To ensure during linkage type flow measurement, under the precision of downstream flow meter
The summation for limiting evaluation, no more than output valve after the self calibration of total pipe network flowmeter；And precision upper limit evaluation summation, no
Less than output valve after the self calibration of total pipe network flowmeter；I.e.：Output valve is between the upper of downstream flow meter after the self calibration of flowmeter
Between lower limit；If correction result is unable to satisfy requirement, above-mentioned repair is repeated again after waiting the instantaneous flow of flowmeter to change
Normal operation method, until meeting the requirements；And if one of flowmeter is still unsatisfactory for requiring by repeatedly amendment, the flow
Meter issues alarm signal, prompts flowmeter failure or is unsatisfactory for situ metrology requirement；
Step 4: the operating condition for upstream and downstream straight pipe measures amendment；According to the insufficient industry of upstream and downstream flow development length
Field condition carries out operating condition metering amendment；And using the instrument coefficient under working condition as industry spot payment foundation, thus greatly
The reliability of amplitude raising flow measurement；The operating condition of upstream and downstream straight pipe measures amendment, it is preferred that emphasis is solves the instrument of flowmeter
Coefficient problem, so that metering is more accurate credible；The flow rate calculation formula of flowmeter is：
In formula：qm- tube fluid mass flow
The corresponding efflux coefficient of C-throttling set, it is related with structural parameters operating parameter
The corresponding orifice diameter of d-throttling set
β-the ratio between throttling set aperture and upstream line internal diameter
Δ P-fluid flows through generated differential pressure value when throttling set
ρ-fluid flows through density when throttling set
The internal diameter of the pipeline that D-fluid flows through
In above formula, after the fluid flowed in pipe determines, the density under certain temperature and pressure is known, once section
The geometric dimension for flowing device determines that then the ratio between its internal diameter of the pipeline D, throttling set aperture and upstream line internal diameter β are it has been determined that become
Amount is differential pressure Δ P, efflux coefficient C and inflatable coefficient ε；Therefore further above formula is rewritten as：
Wherein, instrument coefficient of the K-throttling set under working condition, expression formula are：
In metering process, flow rate calculation is carried out using the instrument coefficient that live straight tube segment data and working condition obtain,
To further increase measuring accuracy.
There are two ways to step 1, flowmeter obtains each batching metering device data：
(1) wirless transmitting and receiving module is set in each batching metering device, wireless transmitter receiver is set in flowmeter
Module；Flowmeter can obtain the continuous data from each batching metering device by wireless module respectively；It is various to adapt to
The use of the small industry spot of ingredient period of change needs；
(2) it is not provided with wireless module in each batching metering device, it is each using being manually entered in virtual wireless transmission equipment
The mode of the continuous data of dispensing equipment；Then, data are issued by flowmeter by virtual wireless transmission equipment；To adapt to ingredient
The use needs for the industry spot that period of change is big or ingredient is basically unchanged.
The step 2, flowmeter carry out self-alignment algorithm in metering process and are：
It is required to meet simultaneously：
In formula：Q1- theory measurement the data Jing Guo process algorithms
Q10The instantaneous flow of flowmeter when-non-self calibration
Q11The precision upper limit flow rate calculation value of flowmeter when-non-self calibration
Q12The precision lower limit flow rate calculation value of flowmeter when-non-self calibration
Q13- the flow value that flowmeter exports after self calibration
The fabrication error numerical value set in Y-flowmeter, can set
S1The measuring accuracy level value of-flowmeter, can input
If self-alignment result is not able to satisfy the requirement to fabrication error setting numerical value, the instantaneous stream of flowmeter is waited
After amount changes, it is further continued for repeating above-mentioned self-calibration algorithm, until meeting the requirements；If calculated by multiple self calibration
After method, above-mentioned requirements are still unable to satisfy, flowmeter issues alarm signal, and flowmeter failure or performance is prompted not to reach
Mark.
The step 3 needs to carry out the anti-interference place between upstream and downstream communication before the implementation of linkage type correction algorithm
Reason；It is interior in measuring instrument in order to farthest reduce influence of the electromagnetic interference to the measuring instrument during wireless telecommunications
Electromagnetic interference detection algorithm is set, i.e.,：Flowmeter by wireless communication mode frequency range 1 emit data after, if setting when
It is interior to detect returned data, then use working frequency range of the frequency range 1 as flowmeter；If frequency range 1 detect returned data when
Between be unsatisfactory for sets requirement, then flowmeter by wireless communication mode frequency range 2 emit data, if returned within the set time
Data-signal then uses working frequency range of the frequency range 2 as flowmeter；If the time that frequency range 2 detects returned data is unsatisfactory for wanting
It asks, then flowmeter emits data, the returned data within the scope of setting time, then using frequency in frequency range 3 by wireless communication mode
Working frequency range of the section 3 as flowmeter；Otherwise repeat the above process, continue the judgement of next frequency range, until meet the requirements for
Only.
The step 4 can also be modified instrument coefficient according to the algorithm of linear interpolation, i.e.,：
In formula：ΔPmaxThe corresponding differential pressure of-design discharge maximum value
ΔPminThe corresponding differential pressure of-design discharge minimum value
Differential pressure value under Δ P-working condition can be read by the differential pressure transmitter at scene
Kmax- instrument coefficient calculates maximum value
Kmin- instrument coefficient calculated minimum
Instrument coefficient under K-working condition
And then reach to the straight pipe amendment that operating condition is measured under the conditions of insufficient；Straight pipe deficiency can be reduced well to meter
The influence of amount, significantly reduces measurement deviation, improves the accuracy and confidence of metering.
Beneficial effects of the present invention：The present invention is analyzed by carrying out the algorithm based on technique to existing flow metering method,
Flowmeter can be produced with the upstream flow media nearest apart from the flowmeter in metering process or operating condition carries out work
Skill comparison, then flow results are calibrated by the self-calibration function in flowmeter.Then, by existing flowmeter and upstream flow
Meter carries out communication interconnection, is attached by the way of based on home control network communication protocol, installs nothing additional inside the flowmeter of intercommunication
Line transmitting and receiving module, and self-recision algorithm is implanted into the chip layer of flowmeter.Meanwhile it can be according to technical process upstream and downstream
The difference of straight pipe carries out Fluid Mechanics Computation calculating to instrument coefficient, obtains the instrument coefficient under working condition.With existing skill
Art is compared, and linkage type industrial flow accurate measurement method of the invention can be avoided flowmeter in design condition and real work
Under the conditions of differentiation bring measurement error, and can interconnect with the other measuring equipments of upstream and downstream, and then improve entire work
The accuracy of industry flow measurement optimizes upstream and downstream production technology, reduces the production cost of enterprise, reaches upgrading synergy, reduces energy
The purpose of consumption.In turn, by improving the accuracy and reliability of flowmeter, to promote industrial automation level, have huge
Economic benefit and social benefit.
Detailed description of the invention
Fig. 1 is the flow diagram of linkage type flow metering method of the present invention.
Fig. 2 is the flow meter function schematic block diagram under conventional metered dose method.
Fig. 3 is the schematic block diagram that the technique during linkage type flow measurement is blended with metering.
Fig. 4 is the self-calibration algorithm block diagram of linkage type flow measurement process.
Fig. 5 is the upstream and downstream communication schematic block diagram between flowmeter.
Fig. 6 is wireless telecommunications electromagnetism interference detection algorithm block diagram.
Fig. 7 is the schematic three dimensional views of certain chemical company's circulating water pipe web frame.
Fig. 8 is the circulating water pipeline VELOCITY DISTRIBUTION cloud atlas of the water pipe web frame of Fig. 7.
Fig. 9 is the circulating water pipeline pressure cloud charts of the water pipe web frame of Fig. 7.
Figure 10 is the circulating water pipeline longitudal section constant speed line chart of the water pipe web frame of Fig. 7.
Figure 11 is the circulating water pipeline longitudal section isobaric chart of the water pipe web frame of Fig. 7.
Specific embodiment
The specific steps that the present invention will be described in detail.The linkage type industrial flow accurate measurement method includes：
Step 1: process algorithms and metering process data interaction.Technique involved in the method for the present invention refers to generation flowing
The technique of medium generates flow media by commercial plant, and the conveying and distribution of fluid media (medium) are then carried out by supervisor's net.Flow
Meter 1 is to be arranged in be responsible for online flowmeter, for measuring the quality or volume flow of commercial plant institute output flow media.?
During traditional flow measurement, flowmeter 1, which measures obtained data, can be transferred directly to industrial control system DCS (distribution metering
Control system, the data transmitted for receiving each self contained instrument), or be transferred to by secondary instrument (or flow computer)
DCS；And then the execution (as shown in Figure 2) of next step is carried out by DCS.
As can be seen from FIG. 2, during traditional flow measurement, it is one relatively lonely that the online flowmeter 1 of supervisor, which is arranged in,
Vertical equipment.The accuracy for the rate-of flow metering that conventional metered dose process nets supervisor and reliability fully rely on flowmeter 1
The performance quality of itself, if instrument coefficient is inaccurate when leaving the factory for flowmeter 1, or occur in metering process being corroded,
Sensor deformation, sensor block, have the problems such as siltation etc. in pipeline, but can still show simultaneously output data, in this way will be right
Industry spot metering brings very big influence, and less serious case makes subsequent technique process be affected, and severe one then may cause considerable safety
Accident.
In metering process, commercial plant generates the data of each process procedure before medium, can be for transmission to flow
In meter 1.As shown in figure 3, the continuous data of dispensing equipment 1, dispensing equipment 2, dispensing equipment 3 can be obtained by flowmeter 1.Due to
Industry spot ingredient is complicated, and ingredient used by different process is also different；Batching metering is if it is solid material, then using weighing
Method calculates the weight unit, and if it is gas, perhaps liquid material is then measured using flowmeter or weighing-appliance.
Flowmeter 1 obtains there are two ways to each batching metering device data：
(1) wirless transmitting and receiving module is set in each batching metering device, wireless transmitter receiver is set in flowmeter 1
Module；Flowmeter 1 can obtain the continuous data from each batching metering device by wireless module respectively.This acquisition number
According to mode, the industry spot small suitable for various ingredient periods of change.
(2) it is not provided with wireless module in each batching metering device, it is each using being manually entered in virtual wireless transmission equipment
The mode of the continuous data of dispensing equipment；Then, data are issued by flowmeter 1 by virtual wireless transmission equipment.This data
Acquisition modes, suitable for the industry spot that ingredient period of change is big or ingredient is basically unchanged.
It, can be existing to each group of data foundation of acquisition after flowmeter 1 obtains the continuous data of each batching metering device
The process conditions of field carry out technology Calculation analysis (technology Calculation analysis chemically and physically reacting from medium generating device
The reaction that journey and different medium generating device are carried out is also different).Such as：The continuous data of present dispensing equipment 1 shows ingredient
1 has A, and ingredient 2 has B, and ingredient 3 has C；Therefore it is (by taking simple relation as an example) that the medium in commercial plant, which generates relationship,：The ingredient of A amount
The medium of the ingredient 3=D amount of the ingredient 2+C amount of 1+B amount.At this point, the efficiency of commercial plant is η, then come out from commercial plant
It should be in MEDIUM THEORY：The amount of η × D.
And so on, if the continuous data of ingredient 1, ingredient 2, ingredient 3 halves, and commercial plant efficiency is constant, then from
It is in the MEDIUM THEORY that commercial plant comes out：0.5 × η × D amount.
After completing above-mentioned technology Calculation analysis, flowmeter 1 itself has had the gross data of metering, the gross data
The as foundation of next step data processing and output.
Step 2: the self calibration of linkage type metering process.Flowmeter 1 is after the data for obtaining batching metering device, meeting
It is compared with itself existing continuous data；Then judge whether it is consistent with theoretical continuous data, if consistent or accidentally
Difference is within allowed band, then it can be assumed that metric results are credible.If error exceeds allowed band, flowmeter 1 is needed to exist
Self calibration is carried out in metering process.
Self calibration has first had to reference data, and reference data derives from the reason that flowmeter 1 generates after industrial analysis
By data；Secondly, self calibration will have the judgment basis of calibration, the judgment basis is derived from the setting to error.Generally, for
The flowmeter of different principle type, error requirements are different, but in general, and error requirements are not more than 1.0% (Coriolis
Flowmeter generally requires within 0.5%, and standard differential pressure flowmeter requires within 1.0%, and electromagnetic flowmeter requires within 0.5%,
Ultrasonic flowmeter requires within 1.0%).Specific error can be missed in each industry spot according to specific requirements
The setting of the poor upper limit.
Self-calibration algorithm schematic diagram of the invention is as shown in Figure 4.It is illustrated by taking flowmeter 1 as an example, in actual metered mistake
Cheng Zhong, flowmeter 1 have the accuracy class of oneself, it is assumed herein that the accuracy class of flowmeter 1 is S.Before not calibrated, flowmeter
The 1 supervisor's net flow measured according to the measuring principle of oneself is Q10；And be added after accuracy class, flowmeter 1 is in the operating condition
Upper limit flow is Q11=Q10×(1+S1), flowmeter 1 is Q in the lower limit flow of the operating condition12=Q10×(1-S1).And in self-correcting
Fabrication error requirement is set in standard, it is assumed that the error requirements set is Y, then flowmeter 1 is according to oneself precision and fabrication error
It is required that carrying out self-calibration process, specific calibration algorithm is：
It is required to meet simultaneously：
In formula：Q1- theory measurement the data Jing Guo process algorithms
Q10The instantaneous flow of flowmeter 1 when-non-self calibration
Q11The precision upper limit flow rate calculation value of flowmeter 1 when-non-self calibration
Q12The precision lower limit flow rate calculation value of flowmeter 1 when-non-self calibration
Q13- the flow value that flowmeter 1 exports after self calibration
The fabrication error numerical value set in Y-flowmeter 1, can set
S1The measuring accuracy level value of-flowmeter 1, can input
If formula (1.2) cannot be met, after waiting the instantaneous flow of flowmeter 1 to change, it is further continued for repeating
Above-mentioned self-calibration algorithm, until meeting the requirements.If being still unable to satisfy above-mentioned want after multiple self-calibration algorithm
It asks, flowmeter 1 then issues alarm signal, prompts flowmeter failure or performance not up to standard, can not be normally used for supervisor's net
The metering of flow.
Step 3: upstream and downstream communication and linkage type correction algorithm.It is upper in the upstream and downstream communication mentioned in the method for the present invention
Downstream refers to the upstream-downstream relationship in technique production.Linkage type correction algorithm refers in particular to the correction algorithm between flowmeter, does not include
End (fluids within pipes generate end, are regarded as the commercial plant of Fig. 1 in the present invention) occurs for flowmeter and processing medium.
It should be strongly noted that needing to carry out anti-between upstream and downstream communication before the implementation of linkage type correction algorithm
Interference processing.Traditional measuring instrument to DCS system generally by the way of wire communication, so by surrounding interference compared with
It is small.And upstream and downstream communication is interfered meeting larger using after wireless communication mode by surrounding, main interference is dry for electromagnetism
It disturbs.So in order to farthest reduce influence of the electromagnetic interference to the measuring instrument during wireless telecommunications, in measuring instrument
In built-in electromagnetic interference detection algorithm.The logic diagram of the algorithm is as shown in Figure 6 (being illustrated by taking flowmeter 1 as an example)：Stream
Meter 1 passes through wireless communication mode after frequency range 1 emits data, if detecting that (this sets returned data within the set time
Fixing time can modify in a program according to different industry spots), then working frequency range of the frequency range 1 as flowmeter 1 is used, is led to
Process is interrogated as shown in timing 1；If the time that frequency range 1 detects returned data is unsatisfactory for sets requirement, flowmeter 1 passes through wireless
Communication modes emit data in frequency range 2, if return data signal within the set time, using frequency range 2 as flowmeter 1
Working frequency range, communication flow is as shown in timing 2；If the time that frequency range 2 detects returned data is unsatisfactory for requiring, flowmeter 1
Emit data in frequency range 3 by wireless communication mode, the returned data within the scope of setting time is then used as flow using frequency range 3
The working frequency range of meter 1.Otherwise it repeats the above process, continues the judgement of next frequency range, until meeting the requirements.Also, such as
Fruit flowmeter 1 can complete it is above-mentioned wherein some when program process, then it is assumed that the anti-electromagnetic interference capability of its communication process is up to standard.
It (is equally carried out by taking flowmeter 1 as an example known to the upstream and downstream communication schematic diagram between flowmeter according to figure 5
The explanation of downstream communication), flowmeter 1 can export wireless flow number Q after the self calibration of its process upstream13.User 1 is right
The net 1 of being in charge of answered installs flowmeter 2, and the data on flows of flowmeter 2 can be transferred to three adjacent flowmeters by wireless module,
I.e.：Flowmeter 1, flowmeter 3 and flowmeter 4 can receive the flow number of flowmeter 2；It is in charge of net 2 and flowmeter 4, stream is installed
The data on flows of meter 4 can be transferred to flowmeter 1, flowmeter 2 and flowmeter 3 by wireless module；It is in charge of the stream that net 3 is installed
The data on flows of meter 3 can be transferred to flowmeter 1, flowmeter 2 and flowmeter 4 by wireless module.The communication of upstream and downstream is
The basis of correction algorithm in linkage type metering, while having broken the information island mode of conventional flow meters amount process.
Flow output valve of the flowmeter 1 after self calibration is Q13, default the accurate flow that the numerical value is main pipe network and measure
Data；And on this basis, carry out the linkage type correction algorithm between flowmeter 2, flowmeter 3 and flowmeter 4.
The precision upper limit evaluation of flowmeter 2 is：Q21=Q2×(1+S2)；The precision lower limit evaluation of flowmeter 2
For：Q22=Q2×(1-S2).Wherein, Q2Flowmeter magnitude before being corrected for flowmeter 2, S2For the accuracy class of flowmeter 2.
The precision upper limit evaluation of flowmeter 3 is：Q31=Q3×(1+S3)；The precision lower limit evaluation of flowmeter 3
For：Q32=Q3×(1-S3).Wherein, Q3Flowmeter magnitude before being corrected for flowmeter 3, S3For the accuracy class of flowmeter 3.
The precision upper limit evaluation of flowmeter 4 is：Q41=Q4×(1+S4)；The precision lower limit evaluation of flowmeter 4
For：Q42=Q4×(1-S4).Wherein, Q4Flowmeter magnitude before being corrected for flowmeter 4, S4For the accuracy class of flowmeter 4.
Correction algorithm needs to meet following condition：
Q22+Q32+Q42≤Q13≤Q21+Q31+Q41 (1.3)
Q31+Q41≤Q13-Q22 (1.4)
Q41≤Q13-Q22-Q32 (1.5)
Formula (1.3)~(1.5) show during linkage type flow measurement, downstream flow meter 2, flowmeter 3 and flow
The summation of the precision lower limit evaluation of meter 4 cannot be greater than output valve after the self calibration of total pipe network flowmeter 1；And the precision upper limit
Evaluation summation cannot be less than output valve after the self calibration of total pipe network flowmeter 1；I.e.：Output valve after the self calibration of flowmeter 1
Between the bound of three flowmeters in downstream.
The realization sequence of correction algorithm is netted adjacent branch's pipe network sequence according to supervisor and is carried out.Above three correction algorithm item
Part will appear in flowmeter 2, flowmeter 3 and flowmeter 4.If above-mentioned correction algorithm is unsatisfactory for, flowmeter is waited
Above-mentioned correction algorithm is repeated again after instantaneous flow variation, until meeting the requirements.If one of flowmeter is through excessive
Secondary amendment is unsatisfactory for requiring, then the flowmeter issues alarm signal, prompts flowmeter failure or is unsatisfactory for situ metrology requirement.
Step 4: the operating condition for upstream and downstream straight pipe measures amendment., it is understood that in practical operation process side
Face, step 4 should be carry out synchronous with step 3；In order to make it easy to understand, therefore step 4 is single-row out.Traditional metering
In the process, the measuring instrument coefficient provided is the instrument coefficient obtained in the ideal situation, can not reflect industry spot
Truth, especially in the insufficient industry spot of upstream and downstream flow development length.The present invention is directed to upstream and downstream flow development length not
The industry spot situation of foot carries out operating condition metering amendment, using the instrument coefficient under working condition as industry spot payment foundation,
To increase substantially the reliability of flow measurement.
In order to which the operating condition metering amendment of upstream and downstream straight pipe is more fully described, by taking flowmeter 1 as an example, it is assumed that flowmeter 1
For differential pressure type throttling set；To incompressible fluid, the flow rate calculation formula of differential pressure type flowmeter is：
In formula：qm- tube fluid mass flow
The corresponding efflux coefficient of C-throttling set, it is related with structural parameters operating parameter
The corresponding orifice diameter of d-throttling set
β-the ratio between throttling set aperture and upstream line internal diameter
Δ P-fluid flows through generated differential pressure value when throttling set
ρ-fluid flows through density when throttling set
After the compressibility of fluid, shown in differential pressure type flowmeter flow rate calculation formula such as formula (1.7)：
Wherein, the inflatable coefficient of ε-fluid, using the thermodynamics universal equation of constant entropy expansion as foundation.
Under conventional conditions, using two variables of efflux coefficient and inflatable coefficient as the emphasis of research.Medium can
The coefficient of expansion can be calculated by formula, and efflux coefficient is obtained by experiment, but the condition tested is in straight pipe abundance
Round tube in, conducted in fully developed flow field.This also leads to the straight tube not being able to satisfy under experimental situation when field condition
When Duan Yaoqiu, final flow measurement the result is that inaccuracy.
The operating condition for the upstream and downstream straight pipe that the method for the present invention proposes measures amendment, it is preferred that emphasis is solves the instrument system of flowmeter
Number problem, so that metering is more accurate credible.By taking differential pressure flowmeter as an example, it can be obtained such as after formula (1.7) is rewritten
Under formula：
Wherein, the internal diameter of the pipeline that D-fluid flows through.
In above formula, after the fluid flowed in pipe determines, the density under certain temperature and pressure is known, once section
The geometric dimension for flowing device determines that then the ratio between its internal diameter of the pipeline D, throttling set aperture and upstream line internal diameter β are it has been determined that become
Amount is differential pressure Δ P, efflux coefficient C and inflatable coefficient ε.
Further formula (1.8) is rewritten, then formula (1.9) can be obtained：
Wherein, instrument coefficient of the K-throttling set under working condition, expression formula are：
The influence of upstream and downstream straight pipe needs the resistance structure in conjunction with upstream and downstream straight pipe front and rear to be divided
Analysis.By the analysis to upstream and downstream straight pipe, can the influence by upstream and downstream straight pipe to flow be integrated into instrument coefficient K it
In.The coefficient reflects the true instrument coefficient under working condition, and the data of differential pressure can pass through the result to fluid analysis
In extract acquisition.This can also establish the real function relational expression of the flow under working condition and differential pressure.It may be noted that
, Fluid Mechanics Computation can't carry out online completely at present, so needing the amendment of straight pipe in installation flow instrument
Database is shifted to an earlier date implant needle to upstream and downstream straight pipe not by the flow dynamics analysis under the conditions of well in advance straight pipe is insufficient before
In the correction algorithm of foot.
Below by taking the metering of the recirculated water at certain chemical company scene as an example, makeover process is measured to the operating condition of upstream and downstream straight pipe
It is illustrated.Certain chemical company straight pipe total length in the metering process of recirculated water is 3.2D, and straight pipe upstream structure is butterfly
Valve, downstream configurations are single elbow, and upstream flow development length is 2.1D, and downstream flow development length is 1.1D, structure such as Fig. 7 institute
Show.If directly being calculated according to formula (1.6), needs straight pipe to meet the requirement of upstream 10D, downstream 5D, could use
Efflux coefficient in formula；However, the industry spot is unable to reach straight pipe requirement, if continuing to produce using formula (1.6)
Raw apparent measurement deviation.
Therefore in order to promote the levels of precision of metering, the pipe network of the recirculated water is carried out in advance using fluid analysis method is calculated
Flow field analysis, analyzing result, (Fig. 8 is circulating water pipeline VELOCITY DISTRIBUTION cloud atlas, and Fig. 9 is circulating water pipeline pressure as shown in Fig. 8~11
Power cloud charts, Figure 10 are circulating water pipeline longitudal section constant speed line chart, and Figure 11 is circulating water pipeline longitudal section isobaric chart).From
In each figure it is found that due to straight pipe wretched insufficiency, cause the flow field in fluid downstream after flowmeter that significant change occurs, in turn
The variation of downstream pressure is affected, so the differential pressure value resulted in herein generates large change with differential pressure value ideally.
According to formula (1.9) it is found that, in order to guarantee that flow is constant, instrument coefficient will change after differential pressure value variation.
Differential pressure variation and instrument coefficient variation and comparing result ideally under working condition, as shown in table 1.It is logical
Perfect condition instrument coefficient can be modified by crossing table 1.Also, by table 1 it is found that if not to the instrument under working condition
Coefficient is modified, and metric results will be made to reduce 5% or more than the actual flow in pipeline.
The metering of 1 operating condition of table and ideal continuous data contrast table
It is participated in flow rate calculation formula (1.9) using the operating condition instrument COEFFICIENT K in table 1, straight tube can be reduced well
The influence to metering that section is insufficient, significantly reduces measurement deviation, improves the accuracy and confidence of metering.If in actual operation
Flow be within the scope of some in table 1, instrument coefficient can be modified according to the algorithm of linear interpolation：
In formula：ΔPmaxThe corresponding differential pressure of-design discharge maximum value
ΔPminThe corresponding differential pressure of-design discharge minimum value
Differential pressure value under Δ P-working condition can be read by the differential pressure transmitter at scene
Kmax- instrument coefficient calculates maximum value
Kmin- instrument coefficient calculated minimum
Instrument coefficient under K-working condition
And then reach to the straight pipe amendment that operating condition is measured under the conditions of insufficient.Above-mentioned correction algorithm is placed in each by program
It is when straight pipe is unsatisfactory for requiring, i.e., executable among flowmeter algorithm.
Claims (5)
1. a kind of linkage type industrial flow accurate measurement method, it is characterised in that：Include the following steps：
Step 1: process algorithms and metering process data interaction；Algorithm based on technique is carried out to existing flow metering method
Analysis, allows flowmeter in metering process, can be with the upstream flow media nearest apart from flowmeter production or operating condition
Carry out process ration；After completing technology Calculation analysis, the gross data that flowmeter itself measures can be obtained；
Step 2: the self calibration of linkage type metering process；Flowmeter obtain batching metering device data after, can with it is existing
The continuous data of itself is compared；Then judge whether it is consistent with theoretical continuous data, if consistent or error is permitting
Perhaps within the scope of, then it can be assumed that metric results are credible；If error exceeds allowed band, need flowmeter in metering process
Middle carry out self calibration；
Step 3: upstream and downstream communication and linkage type correction algorithm；Existing flowmeter and upstream flow meter are used and are based on channel radio
The mode of news agreement carries out communication interconnection, installs wireless transmission and receiving module additional inside the flowmeter of intercommunication, and in flowmeter
Chip layer be implanted into self-recision algorithm；To ensure during linkage type flow measurement, the precision lower limit meter of downstream flow meter
The summation for the value that counts, no more than output valve after the self calibration of total pipe network flowmeter；And precision upper limit evaluation summation, it is not less than
Output valve after the self calibration of total pipe network flowmeter；I.e.：Bound of the output valve between downstream flow meter after the self calibration of flowmeter
Between；If correction result is unable to satisfy requirement, above-mentioned amendment is repeated again after waiting the instantaneous flow of flowmeter to change and is calculated
Method, until meeting the requirements；And if one of flowmeter is still unsatisfactory for requiring by repeatedly amendment, flowmeter hair
Alarm signal out prompts flowmeter failure or is unsatisfactory for situ metrology requirement；
Step 4: the operating condition for upstream and downstream straight pipe measures amendment；According to the insufficient industry spot of upstream and downstream flow development length
Situation carries out operating condition metering amendment；And using the instrument coefficient under working condition as industry spot payment foundation, thus significantly
Improve the reliability of flow measurement；The operating condition of upstream and downstream straight pipe measures amendment, it is preferred that emphasis is solves the instrument coefficient of flowmeter
Problem, so that metering is more accurate credible；The flow rate calculation formula of flowmeter is：
In formula：qm- tube fluid mass flow
The corresponding efflux coefficient of C-throttling set, it is related with structural parameters operating parameter
The corresponding orifice diameter of d-throttling set
β-the ratio between throttling set aperture and upstream line internal diameter
Δ P-fluid flows through generated differential pressure value when throttling set
ρ-fluid flows through density when throttling set
The internal diameter of the pipeline that D-fluid flows through
In above formula, after the fluid flowed in pipe determines, the density under certain temperature and pressure is known, once throttling fills
The geometric dimension set determines that then the ratio between its internal diameter of the pipeline D, throttling set aperture and upstream line internal diameter β are it has been determined that variable is
Differential pressure Δ P, efflux coefficient C and inflatable coefficient ε；Therefore further above formula is rewritten as：
Wherein, instrument coefficient of the K-throttling set under working condition, expression formula are：
In metering process, flow rate calculation is carried out using the instrument coefficient that live straight tube segment data and working condition obtain, with into
One step improves measuring accuracy.
2. linkage type industrial flow accurate measurement method according to claim 1, it is characterised in that：The step 1, stream
Meter obtains there are two ways to each batching metering device data：
(1) wirless transmitting and receiving module is set in each batching metering device, wirless transmitting and receiving module is set in flowmeter；
Flowmeter can obtain the continuous data from each batching metering device by wireless module respectively；Become with adapting to various ingredients
The use for changing period small industry spot needs；
(2) it is not provided with wireless module in each batching metering device, using being manually entered each ingredient in virtual wireless transmission equipment
The mode of the continuous data of equipment；Then, data are issued by flowmeter by virtual wireless transmission equipment；To adapt to ingredient variation
The use needs for the industry spot that period is big or ingredient is basically unchanged.
3. linkage type industrial flow accurate measurement method according to claim 1, it is characterised in that：The step 2, stream
Meter carries out self-alignment algorithm in metering process：
It is required to meet simultaneously：
In formula：Q1- theory measurement the data Jing Guo process algorithms
Q10The instantaneous flow of flowmeter when-non-self calibration
Q11The precision upper limit flow rate calculation value of flowmeter when-non-self calibration
Q12The precision lower limit flow rate calculation value of flowmeter when-non-self calibration
Q13- the flow value that flowmeter exports after self calibration
The fabrication error numerical value set in Y-flowmeter, can set
S1The measuring accuracy level value of-flowmeter, can input
If self-alignment result is not able to satisfy the requirement to fabrication error setting numerical value, the instantaneous flow of flowmeter is waited to send out
After changing, it is further continued for repeating above-mentioned self-calibration algorithm, until meeting the requirements；If by multiple self-calibration algorithm
Afterwards, above-mentioned requirements are still unable to satisfy, flowmeter issues alarm signal, prompts flowmeter failure or performance not up to standard.
4. linkage type industrial flow accurate measurement method according to claim 1, it is characterised in that：The step 3,
Before linkage type correction algorithm is implemented, need to carry out the anti-interference process between upstream and downstream communication；In order to farthest reduce
Influence of the electromagnetic interference to the measuring instrument during wireless telecommunications, the built-in electromagnetic Interference Detection algorithm in measuring instrument, i.e.,：
Flowmeter after frequency range 1 emits data, if detecting returned data within the set time, is adopted by wireless communication mode
Use frequency range 1 as the working frequency range of flowmeter；If the time that frequency range 1 detects returned data is unsatisfactory for sets requirement, flow
Meter emits data in frequency range 2 by wireless communication mode, if return data signal within the set time, is made using frequency range 2
For the working frequency range of flowmeter；If the time that frequency range 2 detects returned data is unsatisfactory for requiring, flowmeter passes through wireless telecommunications
Mode emits data in frequency range 3, and the returned data within the scope of setting time then uses working frequency range of the frequency range 3 as flowmeter；
Otherwise it repeats the above process, continues the judgement of next frequency range, until meeting the requirements.
5. linkage type industrial flow accurate measurement method according to claim 1, it is characterised in that：The step 4, also
Instrument coefficient can be modified according to the algorithm of linear interpolation, i.e.,：
In formula：ΔPmaxThe corresponding differential pressure of-design discharge maximum value
ΔPminThe corresponding differential pressure of-design discharge minimum value
Differential pressure value under Δ P-working condition can be read by the differential pressure transmitter at scene
Kmax- instrument coefficient calculates maximum value
Kmin- instrument coefficient calculated minimum
Instrument coefficient under K-working condition
And then reach to the straight pipe amendment that operating condition is measured under the conditions of insufficient；Straight pipe deficiency can be reduced well to metering
It influences, significantly reduces measurement deviation, improve the accuracy and confidence of metering.
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